weblayer: remove break after return

BUG=none
TEST=none

Change-Id: I2dc1737f17186f434ebe0b98c88c16efba911bd1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2141208
Commit-Queue: Scott Violet <sky@chromium.org>
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Auto-Submit: Scott Violet <sky@chromium.org>
Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#757495}

ui/platform_window/x11/x11_window.cc

@@ -61,7 +61,6 @@ XWindow::WindowType GetXWindowType(PlatformWindowType window_type) {
       return WindowType::kPopup;
     case PlatformWindowType::kDrag:
       return WindowType::kDrag;
-      break;
     case PlatformWindowType::kBubble:
       return WindowType::kBubble;
   }